DTC B1317, B1318SM2445146
DTC B1317, B1318

id040200800300

DTC
B1317, B1318
Power supply system
DETECTION CONDITION
• B1317
― The voltage at DSC HU/CM terminal J is 16.8 V or more.
• B1318
― The vehicle speed exceeds 6 km/h and the voltage at DSC HU/CM terminal J is less than 9.6 V
POSSIBLE CAUSE
• Battery deterioration
• Generator malfunction
• ENGINE 15A fuse malfunction
• Open circuit or short to ground in the wiring harness between the DSC HU/CM terminal J and the battery
• Open circuit or faulty ground in the wiring harness between the DSC HU/CM terminal D and the body ground
• DSC HU/CM malfunction
• Poor connection at connectors (female terminal)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT BATTERY VOLTAGE
• Is the battery terminal voltage normal?
Yes
Make sure that battery terminal connection is normal.
Go to the next step.
No
Charge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING [L3 Turbo].)
(See BATTERY RECHARGING [L5].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [L3 Turbo].)
(See BATTERY REMOVAL/INSTALLATION [L5].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
2
INSPECT BATTERY GRAVITY
• Is battery specific gravity as specified?
Yes
Go to the next step.
No
Replace the battery, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION [L3 Turbo].)
(See GENERATOR REMOVAL/INSTALLATION [L5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
3
INSPECT CHARGING SYSTEM
• Are the generator and drive belt tensions normal?
Yes
Go to the next step.
No
Replace generator and/or drive belt as necessary, then go to Step 6.
(See DRIVE BELT REMOVAL/INSTALLATION [L3 Turbo].)
(See DRIVE BELT REMOVAL/INSTALLATION [L5].)
(See DRIVE BELT REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See GENERATOR REMOVAL/INSTALLATION [L3 Turbo].)
(See GENERATOR REMOVAL/INSTALLATION [L5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
4
INSPECT DSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT
• Start the engine.
• Measure the voltage between DSC HU/CM terminal J and ground.
• Is the voltage approx. 10 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between the DSC HU/CM and ground, then go to Step 6.
5
INSPECT DSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT
• Turn the ignition switch to the LOCK position.
• Measure the resistance between ground and DSC HU/CM terminal D.
• Is the resistance within 0—1 ohm?
Yes
Go to the next step.
No
If there is no continuity:
• Repair or replace the wiring harness for open circuit between the DSC HU/CM and ground, then go to the next step.
If the resistance is not within 0—1 ohm:
• Repair or replace the wiring harness for poor ground, then go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS.)
• Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more.
• Is the same DTC present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.